Question No: 411 – (Topic 3)

When a Cisco IOS gatekeeper receives an LRQ, what is the first step it will take in an attempt to resolve the destination address?

Check to see if the LRQ reject-unknown-prefix flag is set.

Check to see if the destination address matches the technology prefix.

Check to see if the destination address matches the hop-off technology prefix.

Check to see if the destination address matches the remote zone prefix.

Check to see if the LRQ forward-queries flag is set.

Answer: B Explanation:

LRQ – These messages are exchanged between gatekeepers and are used for inter-zone (remote zone) calls. For example, gatekeeper A receives an ARQ from a local zone gateway requesting call admission for a remote zone device. Gatekeeper A then sends an LRQ message to gatekeeper B. Gatekeeper B replies to the LRQ message with either a Location Confirm (LCF) or Location Reject (LRJ) message, which depends on whether it is configured to admit or reject the inter-zone call request and whether the requested resource is registered.

Question No: 412 – (Topic 3)

Refer to the exhibit.

During a QSIG tunneling over SIP call establishment, which two types of SIP messages can the OGW use to tunnel a waiting QSIG message? (Choose two.)

SIP re-INVITE

SIP NOTIFY

SIP INFO

SIP OPTIONS

SIP UPDATE

SIP REFER

Answer: A,E Explanation:

The TGW sends and the OGW receives a 200 OK response-the OGW sends an ACK message to the TGW and all successive messages during the session are encapsulated

into the body of SIP INFO request messages. There are two exceptions:

When a SIP connection requires an extended handshake process, renegotiation, or an update, the gateway may encapsulate a waiting QSIG message into a SIP re-INVITE or SIP UPDATE message during QSIG call establishment.

When the session is terminated, gateways send a SIP BYE message. If the session is terminated by notice of a QSIG RELEASE COMPLETE message, that message can be encapsulated into the SIP BYE message.

Question No: 413 – (Topic 3)

You received this debug output to troubleshoot a Cisco IOS MGCP gateway problem at a customer site. What is the purpose of this message?

The MGCP gateway uses this message to respond to an RQNT message from Cisco Unified Communications Manager.

The MGCP gateway uses this message to respond to an AUCX message from Cisco Unified Communications Manager.

The MGCP gateway uses this message to respond to an AUEP message from Cisco Unified Communications Manager.

The MGCP gateway uses this message to respond to a DLCX message from Cisco Unified Communications Manager.

The MGCP gateway uses this message to respond to an NTFY message from Cisco Unified Communications Manager.

Answer: C Explanation:

This message requests the status of an endpoint. Information that can be audited with this includes Requested Events,DigitMap,SignalRequests,RequestIdentifier,QuarantineHandling, Notified Entity, Connection Identifiers, Detect Events, Observed Events, Event States, Bearer Information, Restart Method, Restart Delay, ReasonCode, PackageList, Max MGCP Datagram, and Capabilities. The response will include information about each of the items for which auditing info was requested.

Question No: 414 – (Topic 3)

Which statement about the iSAC on Cisco Unified Border Element is true?

It is a narrow-band codec.

It has a fixed frame of 30 milliseconds.

It has an adaptive frame of up to 60 milliseconds.

It is designed to deliver wideband sound quality in high-bit-rate applications only.

It is not yet supported on the Cisco Unified Border Element (CUBE)

It is not yet supported on Cisco Unified Border Element.

Answer: C Explanation:

iSAC-Internet Speech Audio Codec (iSAC) is an adaptive wideband audio codec, specially designed to deliver wideband sound quality with low delay in both low and medium-bit rate applications. Using an adaptive bit rate of between 10 and 32 kb/s, iSAC provides audio quality approaching that of G.722 while using less than half the bandwidth. In deployments with significant packet loss, delay, or jitter, such as over a WAN, iSAC audio quality is superior to that of G.722 due to its robustness. iSAC is supported for SIP and SCCP devices. The Cisco Unified Communications Manager IP Voice Media Streaming App (IPVMSApp), which includes Media Termination Point, Conference Bridge, Music on Hold Server, and Annunciator does not support iSAC. MGCP devices are not supported.

Question No: 415 – (Topic 3)

Which ITU-T recommendation defines the procedures for using more than one video channel in H.320-based systems?

A. H.324 B. H.230 C. H.239 D. H.264 E. H.329

Answer: C Explanation:

H.239 is the ITU standard for a second video channel; this is supported by all the major vendors, and is the only content channel standard supported by Cisco acquired Codian products or Cisco TelePresence Serial Gateway Series products on H.323 video calls. Cisco acquired Codian products need to be configured to enable H.239. Any H.323 endpoint that also supports the H.239 protocol can source this channel, as can a VNC connection, though some endpoints need to be configured to use H.239 instead of their proprietary solution.

Question No: 416 – (Topic 3)

What is the name of the logical channel proposal that is transmitted from the called entity to the calling entity in H.323 Fast Connect?

Forward Logical Channel

Backward Logical Channel

Reverse Logical Channel

Originator Logical Channel

Destination Logical Channel

Answer: C

Explanation:

Unlike the OpenLogicalChannel request used by H.323 for video uni-directional logical channels, the request used by H.324 for opening video bi-directional logical channels specifies the temporalSpatialTradeOff Capability in both the forward and reverse directions-

-in the forwardLogicalChannelParameters.dataTypeandreverseLogicalChannelParameters.dataTy pe components, respectively. The semantics of temporalSpatialTradeOffCapability used in forward LogicalChannelParameters.dataType is described in the previous section. The semantics for its presence in the reverse direction is described in this section.

Question No: 417 – (Topic 3)

Which RAS message is used between two gatekeepers to resolve an alias address?

GRQ

ARQ

IRQ

LRQ

RRQ

Answer: D Explanation:

LRQ – These messages are exchanged between gatekeepers and are used for inter-zone (remote zone) calls. For example, gatekeeper A receives an ARQ from a local zone gateway requesting call admission for a remote zone device. Gatekeeper A then sends an LRQ message to gatekeeper B. Gatekeeper B replies to the LRQ message with either a Location Confirm (LCF) or Location Reject (LRJ) message, which depends on whether it is configured to admit or reject the inter-zone call request and whether the requested resource is registered.

Question No: 418 – (Topic 3)

Which two VoIP protocols use SDP to describe streaming media sessions? (Choose two.)

A. SCCP

B. H.323

SIP

MGCP

RAS

cRTP

Answer: C,D Explanation:

The Session Description Protocol (SDP), defined in RFC 2327, describes the content of sessions, including telephony, Internet radio, and multimedia applications. SDP includes information about [8]:

Media streams: A session can include multiple streams of differing content. SDP currently defines audio, video, data, control, and application as stream types, similar to the MIME types used for Internet mail.

Addresses: SDP indicates the destination addresses, which may be a multicast address, for a media stream.

Ports: For each stream, the UDP port numbers for sending and receiving are specified.

Payload types: For each media stream type in use (for example, telephony), the payload type indicates the media formats that can be used during the session.

Start and stop times: These apply to broadcast sessions, for example, a television or radio program. The start, stop, and repeat times of the session are indicated.

Originator: For broadcast sessions, the originator is specified, with contact information. This may be useful if a receiver encounters technical difficulties.

Topic 4, Cisco Unified Communications Manager (CUCM)

Question No: 419 – (Topic 4)

What is the maximum one-way delay, in milliseconds, between any two Cisco Unified Communications Manager servers in a non-Session Management Edition cluster over an IP WAN?

20

40

80 D. 160 E. 250

Answer: B Explanation:

The maximum one-way delay between any two Unified CM servers should not exceed 40 msec, or 80 msec round-trip time. Propagation delay between two sites introduces 6 microseconds per kilometer without any other network delays being considered. This equates to a theoretical maximum distance of approximately 3000 km for 20 ms delay or approximately 1860 miles. These distances are provided only as relative guidelines and in reality will be shorter due to other delay incurred within the network.

Question No: 420 – (Topic 4)

What does a comma accomplish when it is used in a SIP Dial Rule pattern that is associated with a Cisco 9971 IP Phone that is registered to Cisco Unified Communications Manager?

It inserts a 500-millisecond pause between digits.

It causes the phone to generate a secondary dial tone.

It is a delimiter and has no significant dialing impact.

It indicates a timeout value of 5000 milliseconds.

It is an obsolete parameter and will be ignored.

Answer: B

Explanation:

Comma is accepted in speed dial as delimiter and pause. -Comma used to delineate dial string, FAC, CMC, and post connect digits For post connect digits, commas insert a 2 second delay Commas may be duplicated to create longer delays.